Abstract
Using atomically resolved imaging and spectroscopy, we reveal a remarkably deep polarization in nonferroelectric $\mathrm{SrTi}{\mathrm{O}}_{3}$ near its interface with an ultrathin nonmetallic film of $\mathrm{L}{\mathrm{a}}_{2/3}\mathrm{S}{\mathrm{r}}_{1/3}\mathrm{Mn}{\mathrm{O}}_{3}$. Electron holography shows an electric field near the interface in $\mathrm{SrTi}{\mathrm{O}}_{3}$, yielding a surprising spontaneous polarization density of $\ensuremath{\sim}21\phantom{\rule{0.16em}{0ex}}\ensuremath{\mu}\mathrm{C}/\mathrm{c}{\mathrm{m}}^{2}$. Combining the experimental results with first-principles calculations, we propose that the observed deep polarization is induced by the electric field originating from oxygen vacancies that extend beyond a dozen unit cells from the interface, thus providing important evidence of the role of defects in the emergent interface properties of transition metal oxides.
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